Paper-pulp reducing and washing machine.



G. 0. HOWARD.

PAPER PULP REDUCING AND WASHING MACHINE. APPLIOATION FILED BEPT.3,1912-.

W/T/VIESSES: lNVE/VTUH J 4 6W C/%Wa/Id 1 BY V f y urrow/Er PatentedDec.22, 1914.

a Fig. 1.

GUY C. HOWARD, OF EVERETT, WASHINGTON.

PAl PER-PULP REDUCING.AND WASHING- MACHINE.

Specification of Letters Patent.

Application filed September a, 1912. Serial No. 718,306.

To all whom it may concern Be it known that I, GUY C. HOWARD, a citizenof the United States, residing at Everett, in the county of Snohomishand State of Washington, have invented certain new and usefulImprovements in Paper- Pulp Reducing and Washing Machines, of which thefollowing is a specification.

This invention relates to apparatus forv reducing and washing paper pulpmaterial and, more especially, to improvements in apparatus describedand illustrated in patent application Serial No. 660,423, filed November15, 1911.

The object of my improvement is the perfecting of apparatus of thischaracter to render the same more efiicient in operation.

The operation \performed by thedevices which constitute this inventionmay be in the nature of washing for the recovery of chemicals which areutilized in the art for cooking paper stock, as when making soda pulp;or it may combine washing and disintegrating operations, as inmanufacture of kraft pulps, where both a mechanical comminution of thematerial and the cleaning of the same to recover the chemicals arerequired.

The invention consists in the provision of devices whereby water is bothadded to and\ discharged from a tube mill or washer intermediate thefeed and delivery ends there- -of and-in such a manner that the generalflow of the water through the mill is in a direction contrary to thetravel of the material. Y r

In the accompanying drawings, Figure 1 is a view shown partly in sideelevation and partly in longitudinal section of a tube mill with myinvention applied thereto. Figs. 2 and 3 are transverse sections takenthrough 22 and 33, respectively, of

The reference numeral 5 designates a power driven rotary drumhavmghollow trunnions 6 and 7 which are journaled in bearing boxes 8.The material to be treated is supplied from a hopper 6 through thetrunnion 6 and is eventually delivered through a discharge openingprovided in the trunnion When a mechanically efl'ected disintegratingaction upon the ma- .terial treated is to be accomplished within thedrum, the flatter would be supplied with balls or pebbles of suitablesize.

Intermediate the length of the drum are devices wherewith liquid such aswater or chemical solutions may be supplied and withdrawn therefrom. Themeans illustrated in Fi s. 1 and 2 for supplying water into ,the drwater elevators'comprising tubes 9', 9 and 9 which (like that describedin the aforementioned patent application) are fixedly .connected to and.coiled about the drum.

An end of each of these tubes communicates by an opening 10 in thedrum'shell with the interior of the same; while the other ends of thetubes are arranged to serve in their successive revolutions as scoopsfor dipping water from tanks 11', 11 and 11 provided below the drum. Inalternate relation with the water supplyopenings 10, the drum isprovided with water discharge openings 12, 12 and 12 For each of suchopenings is provided a" perforated plate or screen 13. Disposedpreferably upon the Joutside .of

the drum and spanning said water discharge openings are belt plates 14which are formed to provide annular chambers 15, 15 and 15 whichcommunicate with the interior of the drum through the respective waterdischarge openings. In the peripheral wall of each of these chambers areprovided drain holes 16 which may be regulated as totheir livered intothe mill, excepting the small quantity which accompanies the material'asdischarged, flows toward the head end of the mill and escapesprincipally through opening 12 and chamber 15"into the vessel 18'.

' From the latter, water is conducted by a pipe 20' into tank 11 fromwhich it is returned by elevator 9 into the drumand advanced toward thehead end of same. The water thus reintroduced escapes through theopenings 12' and 12 into vessels 18' and 18 and that which isentrainedi'in the last named vessel is conductedby plpe 20 1nto PatentedDec. 22, 1914.

consists of a plurality ofinto the drum b ,water thus supplied to the,drum flows through openings 12 and 12 into vessels 18 and 18 The majorportion of the water accordingly travels by a. succession of steps from.tank 11, near the discharge end of'the drum to the vessel 18 which iscatedwithin a slrort distance of the .drum end through which material isfed to the mill.

By adjusting the sizes of, the drain holes- 16 by bushing the sameit isobvious that the flow of water-between any of the water inlets and thewater-discharge may be regulated to vary the character of the workperformed. The amount of water supplied the various elevators isbestcontrolled by individually regulating the heights of water within therespective tanks.

' 11, .11 and 11 to afford predetermined therefrom if suflicientlyconcentrated with a minimum amounts of water being transmitted throughthe respective elevators. An advantageous manner of regulating theheight of water in the tanks is through the agency of a float 21. withineach tank and which is operatively valveprovided in the associated pipe,A supplementary water supply pipe, as at 19, may be utilized at anypoint throughout the system as, for example, into the tank 11.

23 represents a discharge {30111166131011 for theterminal tank 18although valved outlets, as 23', may be employed for withdrawing thewater from the system intermediate its length for the recovery ofchemicals Among the advantages of the present 'invention, is theprovision of apparatus whereby a tube mill, or washer, may be operatedof water and with a corresponding economy in the recovery ofchemicals'em loyed in the operation of the same and wh ch is principallydue to the, provision of means wherebylthe. water is intermittently usedin a .progressive='travel between the discharge and feed ends of themill. Furthermore, by the peculiar arrangement and disposition of theelements of the invention, a mill is in effect divided'into a series ofzones in which ensue'cii'culatory water courses and milL liquors ofvarious densities being extracted or a single strong liquidniay bewithdrawn from near the feed end of the mill and resulting in the.mate--rial being at its, discharge from the remote end in a practically cleanstate. The oper- I ation is continuous and is performed while the pulpis adjusted and mind through the rotationof the mill. 4

WhileI have described a paper pulp mill or washer, it is to beunderstood that the invention is not confined tosuch' applications as itmay be efl'ectively used in analogous operations as for example-imtheextractionof soluble saccharine matter from 1. In a mill of thecharacter described, a

rotatable drum having an interior chamber provided with means forfeeding material thereinto atone end, and a discharge therefor at theopposite end, a device for supplying liquid to said chamber in proximityto said discharge end of the drum, means for withdrawing said liquidfrom the chamber intermediate said supply device and the feed end ofthedrum, means wherein said withdrawn liquid is caused to flow exteriorlyof the drum towardsaidjed end of the drum, and -a second supply deviceadapted to re-in'troduce said liquid intermediate said withdrawing meansand the feed end of the mill.

2. In a mill of the character described, a rotatable drum having aninterior chamber provided with feed and discharge openings for materialat opposite ends, a plurality of devices for supplying liquid to saidchamber lntermediate said ends, .means interposed between said supplydevices for discharging said llqu d, and means exterior of said drumvsecured to said drum afiprding an annular chamber about the drum, ascreen rigidly connected to said drum having perforationscommunicatively connecting the interior of the drum with said chamber,and an outlet for said chamber.

4. The combination ofa rotatable drum provided with an opening for thefeeding of material into one end a'ndan opening for the delivery of thesame from the opposite end, said drum being provided with openings forthe discharge of liquid intermediate the aforesaid. openings, means .forreceiving the liquid thus discharged, and means for returning suchliquid into the drum. 7 i

5. A rotatable drum provided with openings at its opposite ends throughwhich material to be treated is res ectively fed into and dischargedfrom the rum, in combination with means whereby a liquid may ,be

introducedinto the drum in proximity to the discharge opening thereofandthen be caused to travel in a direction opposite to liquid dischargeopenings provided intermediate the aforesaid openings, of means wherebythe liquid escaping from the various liquid discharge openings, isreturned progressively into the drum and delivered in proximity to therespective liquid discharge openlngs.

7. The combination with a rotatable drum provided with openings at itsopposite ends for the supply and withdrawal of material to and from thedrum, and having a plurality of openings for the discharge of liquidintermediate the ends of the drum, of vessels for receiving the liquiddischarged from the respective water-discharge openings, and a tankconnected with one of the aforesaid tanks, and means whereby the liquidis conveyed from such supplementary tank into the interior of the drumand thence be returned through the liquid discharge openings to saidvessels. I

8. In a mill of the class described, a rotatable drum having an interiorchamber, a plate secured to and revoluble with the drum a ifording achamber exteriorly of the drum, a screen interposed between saidchambers, an outlet for-said exterior chamber, a receptacle forreceiving the matter discharged from said outlet; and means wherebysaid' discharged matter may be reintroduced within the mill.

9. In a mill of the class described, a rotatable drum having an interiorchamber provided with a feed opening at one end and a discharge openingat the other, a plate secured to and revoluble with the drum foraffording a chamber exteriorly of the drum, a screen interposed betweensaid chamber to permit the passage of fluids, an outlet for saidexterior chamber, a receptacle for receiving said fluids from saidoutlet wherein said fluids are conveyed longitudinally of chambertherein wherein the material under treatment is introduced at one end ofthe mill and discharged at the opposite end, of'

means for introducing an auxiliary supply of water within said chamberand causing said water to flow axially of the mill in a directionopposite to the course of said material,

i 11. In a mill of the class described Wherein the material to betreated is caused to progress continuously through the mill from one endto the other, a plurality of devices for supplying Water to the mill, aplurality of means whereby said water is discharged from the mill, saidsupply devices and discharge means being alternately positionedlongitudinally of the mill, and a receptacle exterior of the mill forreceiving the water from said discharge means and delivering same to therespective supply device. v

12. In a mill of the class described, Wherein the material to be treatedis caused to progress continuously through the mill from end to end, ofmeans whereby water is alternately introduced and Withdrawn from saidchamber aplural number of times, the general course of said water beingcontrary to the direction of travel of said material.

Signed at Everett, Washington, this 26 day of August, 1912.

GUY O. HOWVARD. Witnesses:

PIERRE BARNES, J. V. WOODWARD.

